Lamps with electronic ballasts do not require a separate ignition system, as it is integrated in the ballast. In the case of fluorescent lamps with magnetic ballasts, a starter is used for ignition.

High-pressure lamps

High-pressure mercury lamps ignite at mains voltage, whereas high-pressure sodium lamps and metal-halide lamps can only be ignited with the help of a suitable igniter.

Igniters

A distinction can be made between superimposed pulse igniters, in which the ignition voltage is generated in an integrated high-voltage transformer, and impulsers, which deliver impulses to the ballast to generate the high voltage required. Superimposed pulse igniters are subject to a maximum permissible distance between the lamp and the igniter (e.g. 1.5 m).

Run-up period

Following ignition, high-pressure lamps take a few minutes (up to 10 min.) to reach full luminous flux (run-up period). During this period a higher run-up current flows (up to twice rated current). Once switched off, the lamps can only re-ignite after cooling down for a few minutes (cf. restriking). Immediate restrike is possible with double-ended metal halide lamps and high-pressure sodium lamps fitted with a suitable igniter.